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Environmental Trends and Requirements
With the increasing degree of industrialization, air pollution has become a growing concern, especially the issue of nitrogen oxides emissions. China has successively introduced corresponding standards and requirements (including local standards), and the requirements for nitrogen oxides e
| Serial Number | Standard Number | Standard Name | Pollutant | Emission | Remarks | ||||
| 1 | GB28665-2012National Standards | Atmospheric Pollutant Emission Standards for the Rolling Steel Industry | Nitrogen Oxides | 300mg/m³ | |||||
| 2 | DB13/2169 2018Hebei Provincial Standards | Ultra-Low Emission Standards for Atmospheric Pollutants in the Iron and Steel Industry | Nitrogen Oxides | 150mg/m³ | |||||
| 3 | GB11-501-2017Beijing Municipal Standards | Comprehensive Indicators for Atmospheric Pollutant Emissions | Nitrogen Oxides | 100mg/m³ | Industrial Kiln | ||||
| 4 | Ultra-Low Emissions | Nitrogen Oxides | 50mg/m³ | Not Yet in Industrial Furnace | |||||
NOx Hazards
When inhaled into the deep parts of the lungs, it can cause bronchitis or emphysema. NOx can also react photochemically with other pollutants in the atmosphere, forming photochemical smog pollution. NO, when oxidized in the atmosphere, transforms into nitric acid, which is one of the causes of acid rain. NO can also reduce the ozone in the stratosphere, thereby increasing the amount of ultraviolet radiation reaching the Earth.
Formation Mechanism
Thermal Type
Thermal NOx is generated by the oxidation of nitrogen in the air under high temperature conditions, and its generation amount depends on the temperature. When T < 1500ºC, the amount of NO generated is minimal, but when T > 1500ºC, the reaction rate increases by 6-7 times for every 100ºC increase in temperature.
Fuel Type
Fuel NOx is produced by the thermal decomposition and oxidation of nitrogen compounds in the fuel during combustion, and it is closely related to the oxygen concentration near the flame.
Prompt Type
Prompt NOx is rapidly generated in the reaction zone when the concentration of hydrocarbon fuel is high during combustion. Under normal furnace temperatures, the intensity of its formation is negligible.
Solution
According to the different mechanisms of nitrogen oxides formation, in the context of the industrial kiln industry, the generation of nitrogen oxides during combustion is mainly of the thermal type:
Fuel-type NOx primarily depends on the composition of nitrogen compounds in the fuel itself, which can be addressed through pre-treatment such as purification.
Prompt-type NOx has a minimal contribution and can be neglected.
Considering the above, we mainly focus on controlling thermal-type nitrogen oxides, which can be divided into in-process combustion control and post-combustion control. Post-combustion control methods include catalytic methods, carbon adsorption, and ozone methods, among others, which will be introduced separately. However, these methods generally involve high investment and operating costs.
Therefore, we have introduced low-NOx burners for in-process combustion control. In the design, we fully consider factors such as air and fuel gas mixing angles and staged combustion to reduce the theoretical combustion temperature and local high-temperature zones, ultimately achieving the goal of reducing nitrogen oxides generation.
This solution is suitable for various types of industrial kilns using conventional combustion technologies and fueled by natural gas, coke oven gas, mixed gas, etc.
Experimental Furnace and Energy Medium Pipeline for Low Nitrogen Burner Testing
Temperature Field Simulation
CED numerical simulation of long and short fame in the furnace
Company Profile
Vision
With decades of rapid development and accumulation, China has been perfect and mature in technology and management in various industrial areas, shaping a complete processing manufacturing industry with competitive prices, well known for its excellent skill, high efficiency, and hardworking team with qualification for personnel dispatching.
At the time of economic globalization, it is our consistent target and objective to integrate and export all kinds of technology, management mode, engineering project, and manpower as per the actual requirement of our client with our abundant technical strength, superior integration capability of technology and resources, well experienced project implementation and management as basis and platform.
Let China go out to the world, and make the world know of China.
At the time of economic globalization, it is our consistent target and objective to integrate and export all kinds of technology, management mode, engineering project and manpower as per the actual requirement of our client With our own abundant technical strength, superior integration capability of technology and resources, well experienced of project implementation and management as basis and platform;
Let China go out to the world, and make the world know of China;
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