1. Material of ammonia spray gun Because the working temperature of SNCR denitrification spray gun is relatively high (the flue gas temperature is 850℃-1100℃, and the flue gas flow rate is also fast, and there is a lot of dust in the flue gas, which is very severe for the wear of the spray gun. Therefore, the spray gun requires: high temperature resistance, wear resistance, and corrosion resistance. The key parts of the spray gun, such as the spray gun rod, are made of stainless steel 310S and Hastelloy.
2. The degree of uniformity of mixing between the ammonia spray gun spray and the flue gas
The spray angle of SNCR denitrification spray gun ranges from 10°-150°. The spray gun with a small angle has strong penetration ability, and the spray gun with a large angle has a large coverage area. The length of the spray gun and the depth of the eruption point in the furnace are also different. Use a variety of spray guns with different angles and different directions Through CFD flow field simulation analysis combined with on-site measurement conditions to achieve the best design, a higher denitrification efficiency can be achieved.
3. Service life and protection of ammonia spray guns. When the SNCR denitrification spray gun nozzle is working in a pawn environment, the water pressure and air pressure do not exceed 0.6Mpa, so the wear on the nozzle is very small. The spray gun is equipped with a protective sleeve, and the nozzle is completely placed in the protective sleeve to prevent high temperature, high dust and high-velocity flue gas from wearing the spray gun nozzle. Ammonia spray guns can be used for cooling and dust removal. Thermal power plants, cement plants, refractory material processing plants and coal-fired boilers will generate a lot of smoke and exhaust gas during production and operation. In response to their pollution to the environment, bag dust removal, electrostatic dust removal, mechanical dust removal, etc. have appeared at home and abroad. Air filtration and wet spray dust removal technologies.
4. Ammonia spray gun adjustment ability SNCR denitrification spray gun has flexible adjustment ability. When there is a small discrepancy between the on-site working conditions and the design, the spray gun position can be partially adjusted to ensure the efficiency of denitrification.
5. Ammonia spray gun atomization particle size and flow rate The atomization particles of the SNCR denitrification spray gun are not like flue gas cooling. The finer the better, but the particles should be moderate. If the particles are too fine, the penetration is too poor, which reduces the denitrification efficiency. If the particles are too coarse, the overall surface area of the particles is too small, which also reduces the denitrification efficiency. Moreover, if the particles are too large, due to the fast flue gas flow rate, the spray particles cannot be completely vaporized in a short time, and sometimes dripping will occur, resulting in furnace pipe burst. The spray gun flow rate is 3-250kg/h, and the spray shape is Solid cone and fan-shaped.
6. Ammonia spray gun determines the position of the spray gun to determine the gas temperature inside the boiler. When using urea solution, try to set the position within the temperature range of 950±50. When using ammonia solution, try to set it within the range of 900±50 degrees, avoid the flame, and generally ensure a reaction time of more than 0.5 seconds, and the mixing degree should be better. The selection of the spray gun position is the key place of the entire SNCR system. The spray gun installation should be slightly tilted downward and must be extended to a certain safe distance. The selection of the appropriate ammonia spray gun position is mainly achieved through two ways:
①CFD flow field simulation to determine the best spray gun injection point;
②By installing a temperature sensor to test the temperature distribution in the furnace, determine the spray gun injection position.
7. Installation and connection method of ammonia spray gun SNCR denitrification spray gun has several connection methods to choose from, including flange fixed connection, quick connector fixed connection and threaded fixed connection. Ammonia denitrification spray guns are widely used in flue gas denitrification in thermal power boilers, cement, garbage incineration and other industries.
