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DLZ-200 plasma ignition burner

key word:Heat exchange element

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Product description

DLZ-200 plasma ignition burner

 

1. Brief.

Large industrial pulverized coal boiler ignition and stable combustion are traditionally used to burn heavy oil or natural gas and other rare fuels to achieve, in recent years, with the worldwide energy constraints, the rising price of crude oil, thermal power plants used to ignite and stable combustion of fuel costs have increased dramatically, so the boiler ignition and stable combustion with oil is done as an important indicator of the production process to assess, in order to reduce the consumption of heavy oil (gas) In order to reduce the consumption of heavy fuel oil (natural gas), the traditional practice is to improve the fineness of pulverized coal, improve the temperature of the air-powder mixture and the secondary air, use the pre-combustion chamber burner, use a small oil lance ignition and so on, but these means can only be less fuel, but can not do a complete lack of fuel, if you want to further reduce the fuel to the end of the fuel, we must use a completely new and completely different from the traditional process, the DLZ-200-type plasma pulverized coal ignition burner, the DC air plasma as the fuel for the ignition of the boiler. DLZ-200 Plasma Coal Ignition Burner adopts DC air plasma as the ignition source, which can ignite the poor coal with low volatile matter (10%) and realize the cold start of the boiler without using a single drop of fuel oil, and it is the preferred equipment for ignition and stable combustion of the future coal-fired power plant.

 

2. Ignition mechanism

DLZ-200 plasma ignition device utilizes DC (280-350A) in the medium vapor pressure of 0.01-0.03MPa under the conditions of contact arc, and in a strong magnetic field to obtain stable power DC air plasma, the plasma in the primary combustion cylinder burner to form a T>5000K The plasma in the primary combustion cylinder of the burner to form a T>5000K gradient of the local high temperature zone, the coal particles through the plasma "fire core" by the high temperature, and in 0.001 seconds to rapidly release the volatile components, and make the coal particles rupture and crushing, so that rapid combustion. Since the reaction is carried out in the gas phase, the particle size of the mixture components changes. As a result, the burning speed of the coal dust is accelerated, which also helps to accelerate the combustion of the coal dust, which greatly reduces the ignition energy E required to induce the combustion of the coal dust, and it is proved by tests that (E plasma = 1/6E oil).
In addition, the legal active particles within the plasma, such as atoms (C, H, O), atom groups
(OH, H2, O2), ions (O2 -, H2 -, OH -, O -, H +) and electrons can accelerate the thermochemical conversion and promote complete combustion of the fuel, and the plasma for the pulverized coal can be compared to the usual situation to increase the 20%-80% of the Volatile matter, that is, plasma has the effect of recreating volatile matter, which is of special significance for igniting low volatile matter pulverized coal to strengthen combustion. Especially for the use of complex coal boilers, more prominent significance.

 

 

3. Plasma Ignition System Composition


The plasma system mainly includes: combustion system, electrical system, cooling water system, air film wind system, control system, and monitoring system.
 

3.1 Combustion system
Plasma burner is a pulverized coal burner that ignites pulverized coal with the help of plasma generator's arc. Compared with previous pulverized coal burner, plasma burner ignites pulverized coal with plasma arc at the initial stage when pulverized coal enters into the burner and enlarges the flame step by step inside the burner, which is an internal combustion burner, and it can ignite the pulverized coal directly without flame inside the furnace chamber, so as to realize the boiler's oil-free startup and oil-free low-load thus realizing oil-free starting and oil-free low load steady combustion of the boiler.

3.2 Electrical system
The plasma generator power supply system is used to generate the DC power supply device to maintain the stability of the plasma arc. The basic principle is to turn the three-phase AC power supply into a stable DC power supply through a three-phase fully controlled bridge thyristor rectifier circuit. It consists of two main parts: the isolation transformer and the power supply cabinet. Power cabinet mainly consists of six groups of high-power thyristors composed of three-phase fully controlled rectifier bridge, high-power DC governor 6RA70, DC reactor, AC contactor, control PLC and so on.

3.3 Cooling water system
Cooling water system adopts closed loop system, which consists of cooling water tank, cooling water pump, heat exchanger and valves, pressure gauges, piping, cooling water pumps, three sets of each other as a backup. It mainly cools the cathode and anode of the plasma generator that forms the arc by means of water cooling.

3.4 Air film wind system
The plasma burner belongs to internal combustion burner, and the load on the inner wall of the burner is high when it is in operation. In order to protect the burner and improve the combustion degree at the same time, it is necessary to set up air film wind for the plasma burner. The air film cooling wind can be taken from the original secondary air box, or from the outlet of the blower.

3.5 Control system
Plasma control system consists of a plasma control cabinet and touch screen, the cabinet PLC using SIEMENS S7-300 series of programmable controllers to complete. The Profibus interface in this CPU module can be simply connected to several ignition controllers in order to centralize the control of all ignition devices through the network. The GP touch panel manufactured by Digtal is used as the operation interface, which provides a concise operation mode and complete information display for on-site operation.

3.6 Monitoring System
The monitoring system consists of image fire detection probe, industrial TV and four-screen splitter, which mainly monitors the plasma combustion in the furnace chamber.

 

4. Working principle of plasma generator
The generator is a magnetically stabilized air carrier plasma generator, as shown in Figure A. It consists of a coil, cathode and anode. The cathode is made of metallic or non-metallic materials with high electrical conductivity. The anode is made of high electrical conductivity, high thermal conductivity and oxidation-resistant metal materials, which are water-cooled to withstand the high temperature impact of the arc. The coil has the ability to resist 2000V DC voltage breakdown under high temperature 250℃, and the power supply adopts full-wave rectification and has constant current performance. The arc principle is: first set the output current, when the cathode 3 forward with the anode 2 contact, the entire system has the ability to resist short-circuit and constant current, when the cathode slowly away from the anode, the arc in the coil under the action of the magnetic force pulled out of the nozzle outside. A certain pressure of air under the action of the arc, is ionized into a high temperature plasma, its energy density up to 105 ~ 106W/cm2, for the ignition of different types of coal to create a good condition.

 

 

5. Plasma generator composition


The plasma generator is a device used to generate high-temperature plasma arcs, which is mainly composed of three major parts: anode assembly, cathode assembly, coil assembly, and support bracket for on-site installation. The design life of the plasma generator is 5 to 8 years. Anode assembly and cathode assembly including the two metal electrodes used to form the arc anode and cathode, between the two electrodes with a stable high current, the air between the electrodes will be ionized to form a high temperature conductive properties of the plasma, in which positively charged ions flow to the negative side of the power supply to form the arc cathode, negatively charged ions and electrons flow to the positive side of the power supply to form the arc of the anode. The coil is energized to produce a strong magnetic field that compresses the plasma and is blown out of the anode by compressed air to form a high temperature arc that can be utilized.


5.1. Anode assembly
The anode assembly consists of the anode, cooling water channel, compressed air channel and housing. The conducting surface of the anode is cast in a highly conductive metal material, cooled by water cooling, and has a continuous operating time of more than 500 hours. In order to ensure that the arc can be pulled out of the anode as much as possible, the arc-pressing sleeve is added to the anode.

 

5.2. Cathode assembly
Cathode assembly consists of cathode head, outer casing, inner casing, drive mechanism, inlet and outlet, conductive joints, etc., the cathode for the rotating structure of the plasma generator also needs to be installed with a set of rotating drive mechanism. The conductive surface of the cathode head is casted with highly conductive metal material, cooled by water cooling, and the continuous working time is more than 50 hours.

 

5.3. Coil assembly
The coil assembly consists of coils wound by conductive tubes, insulating materials, inlet and outlet water joints, conductive joints, shells, etc. The coil assembly is cooled by water inside the conductive tube. The conductive tube is cooled by water and has a life span of 5 years.

 

5.4. Plasma Electrical System
The plasma generator power supply system is used to generate a DC power supply unit that maintains a stable plasma arc. Its basic principle is through the three-phase fully controlled bridge thyristor rectifier circuit will be three-phase AC power supply into a stable DC power supply. It consists of two main parts: the isolation transformer and the power supply cabinet. Power cabinet mainly consists of six groups of high-power thyristors composed of three-phase fully controlled rectifier bridge, high-power DC governor 6RA70, DC reactor, AC contactor, control PLC and so on.

 

 

 

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