ZXOQM fuel oil and gas burners are fully automatic, safe and reliable products. The design and manufacture of burners are based on economy, safety, service and environmental protection. Our gas burners comply with EN676 standards; oil burners comply with EN230 and EN267 standards.
1. Structure
All burner parts are mounted directly on the burner body. The aluminum alloy casting shell is equipped with the motor for running the fan and oil pump. The stainless steel alloy burner head and diffuser can withstand high temperatures up to 1200℃. The burner air volume is adjustable so that the fuel can be fully mixed to achieve full combustion. There is a flame viewing mirror in the burner to observe the flame. There is an air adjustment baffle at the suction port of the fan connected to the servo motor to automatically control the amount of fuel and air based on different load parameters. Its removable cover makes circuit installation and fuel maintenance more convenient.
2. Installation and reasonable application
The burner is suitable for hot water boilers, steam boilers, hot air heating furnaces and various process heating. Zhongxuan Ochiman burners are suitable for use in high back pressure boilers. The burner can be installed on the boiler horizontally, vertically upward or vertically downward. The burner needs to operate in a rainproof working area with a maximum ambient temperature of +50°C and a maximum relative humidity of 80%. The normal working altitude is 500 meters above sea level (can be supplied according to different altitude requirements).
The protection grade of the machine is IP44.
3. Power regulation method
The proportional burner is equipped with a servo motor with a switching time of 30 seconds/180°. The proportional burner makes stepless adjustments according to the heater load. During adjustment, the air-fuel ratio of each different power range of the burner is adjusted according to the customer’s load.
4. Flame detector
All models of burners are equipped with flame detectors, which use ionization rods in gas models and photoresistors and ionization rods in oil models.
5. Control equipment
ZXOQM burner integrated intelligent combustion control system. The control system is built into the burner, and the control unit can automatically control each operating stage of the burner. In the event of a combustion failure, the control system can automatically shut down. The load control has been set on the burner before leaving the factory, and an external load control can also be selected according to customer requirements.
6. Advantages of ZXOQM burner
- Integrated design, easy installation
- Precise electronic control ensures optimal combustion
- Operation visualization
- Flexible communication methods
- Easy commissioning and service
- Low NOx Models
- Low NOx emission values depend on specific operating conditions including furnace size.
Low NOx burner technical description
Low NOx burner refers to a burner with low NOx emissions during fuel combustion.
Can reduce the emission of nitrogen oxides during the combustion process.
The nitrogen oxides produced during the combustion process are mainly NO and NO2, which are usually referred to as
Nitrogen oxides, the nitrogen compounds contained in the fuel are thermally decomposed and then oxidized during the combustion process. In most combustion devices, the former is the main source of NO. We call this type of NO “thermal reaction NO”, the latter is called “fuel NO”, and there is also “instant NO”.
The NO formed during combustion can react between nitrogen atoms to reduce NO to NO2.
In addition to these reactions, NO can also react with various nitrogen compounds to generate NO2. When the reaction reaches chemical equilibrium in an actual combustion device, the [N02]/[N0] ratio is very small, that is, the amount of NO converted into NO2 is very small and can be ignored.
Combustion Technology to Reduce NOx
NOx is produced by combustion, and the combustion method and combustion conditions have a great influence on the generation of NOx.
NOx can be reduced by improving combustion technology. The main ways are as follows:
Select fuels with lower nitrogen content, including denitrification of fuels and conversion to low-nitrogen fuels;
Reduce the excess air coefficient and organize over-rich combustion to reduce the concentration of oxygen around the fuel;
In the case of less excess air, the temperature peak is reduced to reduce “thermal reaction NO”;
Under low oxygen concentration conditions, the time that combustibles stay in the flame front and reaction zone is increased.
The specific methods commonly used to reduce the emission of NOx formation are:
a. Furnace center backfire nitrogen reduction;
b. Multi-stage swirl air distribution method; c. Graded flue gas reflux ratio method, etc.
How did Xuanxuan achieve low nitrogen technology?
Xuanxuan invested heavily in introducing CFD simulation software at the end of 2015, breaking through the bottleneck of ultra-low nitrogen Meilan combustion research and development in one fell swoop, and has three core technologies:
a.Nitrogen reduction by backfire in the center of the furnace;
b.Multi-stage swirl air distribution method;
c.Graded flue gas reflow ratio and other methods. (See the diagram on the next page)
CFD simulation is an important tool for R&D work. We use CFD simulation to analyze various combustion processes to achieve low emissions. It is also an important guarantee for the successful operation of large projects.
1. Central backfire nitrogen reduction:
The unique fresh air swirl design creates a negative pressure vacuum zone at the moment of primary combustion of the outer flame under the action of high-speed air flow, thereby providing secondary combustion support for the central flame, while achieving low nitrogen emissions and almost zero carbon monoxide .
Ultra-low nitrogen combustion technology
Gas recirculation :
Flue gas recirculation guides part of the flue gas back to the burner and mixes it with air for secondary combustion.
The flame temperature and nitrogen oxide emission are reduced. Flue gas recirculation can reduce nitrogen emission by 80%.
Staged combustion and internal circulation of flue gas :
Staged combustion divides the combustion chamber into fuel-rich combustion and lean combustion zones. This partitioning prolongs the time required for fuel and air to be fully mixed. The purpose of fuel distribution is to reduce the maximum temperature at the center of the flame. This technology can reduce nitrogen oxide emissions by 20-30%.
Fully premixed combustion technology
Full pre-combustion is an effective low-nitrogen technology, but it requires a large excess air coefficient (60%-70%) and results in serious gas waste. It is suitable for areas such
as the United States where gas is cheap and air and gas quality are relatively good. Domestic air and gas quality are relatively poor, and operation and maintenance are troublesome. “Beijing Quality Supervision and Inspection [2017] No. 6 Document” clearly states that surface combustion is not recommended for boilers over 10 tons.