Introduction to Yuneng Low Nitrogen Combustion Process (YNLNC):
According to the influence of NOx generation factors and temperature, oxygen content, reaction time, as well as the physical and chemical characteristics of fuel, YNLNC technology is to recycle part of the burned exhaust gas introduced at the side of the combustion air inlet during the fuel combustion stage; By integrating independent servo control, the proportion of air, fuel and exhaust gas can be adjusted to achieve low nitrogen emissions, while maintaining high reliability of operation; Integrated and optimized structure of integrated low nitrogen combustion system, easy to install and maintain. YNLNC system is a professional technology independently developed by the company, and has independent core technology property rights.
Principle:
The increase of temperature can promote the formation of NOx. The higher the N in the fuel, the higher the oxygen concentration, and the longer the reaction residence time, the greater the formation of NOx. NOx decreases with the reduction of excess air coefficient. The following measures can be taken to inhibit the generation of NOx:
1) Reduce the boiler peak temperature and reduce the fuel quantity in the combustion zone.
2) To ensure the output of the boiler and control the air distribution, the quantity of combustion supporting air in the central area of the combustion flame is controlled, the residence time of combustion products in the high-temperature flame area is shortened, and the simultaneous existence of high temperature and high oxygen concentration is avoided.
3) A reburning zone is set in the furnace to reduce NO to N2 by using the hydrocarbon radical CH+and incomplete combustion products CO, H2, C and CnHm generated in the main combustion zone.
4) 80%~85% of the fuel is sent to the main combustion area, where the fuel burns to generate NOx, and 15%~20% of the fuel is sent to the reburning area, where the excess air coefficient is less than 1.0( α< 1.0), has a strong reducing atmosphere, and NOx generated in the main combustion zone is reduced; The reburning zone can not only reduce the generated NOx, but also inhibit the generation of new NOx; A certain amount of air (called burnout air) is supplied in the burnout area to ensure that incomplete combustion products from the reburning area are burned out. According to the principle of ultra-fine pulverized coal reburning low NOx combustion technology and previous research results, the whole furnace combustion zone is divided into main combustion zone, reburning zone and burnout zone.
Technical advantages
1) YNLNC process can divide the furnace into three relatively independent parts: combustion zone, NOx reduction zone and burnout zone. The excess air coefficient of each area shall be reasonably controlled. This improved air classification method can greatly improve the combustion efficiency while effectively reducing NOx emissions by optimizing the excess air coefficient of each area.
2) The low nitrogen combustion characteristics of YNLNC process, on the premise of ensuring stable and efficient combustion, not only ensure stable combustion of fuel by using efficient concentration dilution separation technology, space combustion classification technology, primary air reverse jet and other means, but also achieve on-demand air supply in the furnace and reduce flue gas temperature deviation at the furnace outlet by using adjustable burn out tuyere technology, and more importantly, achieve ultra-low NOx combustion emissions from the boiler.
3) YNLNC process also has better characteristics of reducing flue gas temperature deviation at furnace outlet. The use of staged combustion technology is not only an important means to reduce NOx emissions and improve fuel burn down rate, but also helps to reduce the wall temperature deviation of superheater and reheater caused by flue gas temperature deviation at both sides of furnace outlet
4) YNLNC low nitrogen combustion technology has no operating cost. It not only realizes the low nitrogen emission of the boiler, but also realizes the characteristics of high efficiency and stable combustion, anti slagging, high temperature corrosion resistance, low load and stable combustion of the boiler, expands the fuel adaptability of the boiler and other functions, and has achieved excellent results in industrial applications.
5) The YNLNC process makes the high-temperature flue gas stay in the furnace for a relatively long time, which is conducive to radiation and heat release. The thermal efficiency is increased by more than 0.5 to 3%, saving fuel consumption. The installation is simple and easy. There is no corrosion of flue gas condensate to the boiler, which completely solves the corrosion problem of flue gas condensate to the boiler body and extends the service life of the boiler. YNLNC process can adopt flue gas internal circulation mode, without worrying about the influence of flue gas condensate on the combustion stability of the burner, so it is safe to operate.
6) The YNLNC system has significant technical advantages, advanced and mature technology, reasonable cost, fewer operators, less operating costs, simple operation, convenient maintenance, safe and reliable system, high efficiency and energy saving, reasonable system design, ensuring the safety of personnel and equipment, and energy saving.
Shenyang Yuneng Mechanical Engineering Technology Co., Ltd
Contact person for drying and calcining technology: Yu Zongchun (teacher)
Tel: 13904039686
Contact person of environmental protection and energy conservation technology: Jiang Baoyi (teacher)
Tel: 18102429424
Marketing Department Contact: Yu Lei (Manager)
Tel: 13080705497
Address: No. 8-19, Fumin South Street, Hunnan New District, Shenyang