Ammonia desulfurization and denitrification is an engineering technology that uses ammonia (NH3) as an absorbent to fix gaseous sulfur compounds in industrial waste gas into ammonium salts or reduce them into elemental sulfur, and convert nitrogen oxides into nitrogen to achieve clean emissions. According to Zhisheng Weihua, Guo Gong, cement The height of the plant chimney is about 100m, the fuel is bituminous coal, the heat is 6000 kcal, and the flue gas flow rate is 10m/s. High temperature ammonia desulfurization technology, through the reaction of ammonia and sulfur dioxide kiln The tail temperature is 900 ℃, the spraying concentration is 20% ammonia, and the daily consumption of 5000 ton kiln is about 800 kg ammonia. Under this condition, whether the homogeneous reaction ammonia participates in the reaction in the liquid state or in the gaseous state, it will react with sulfur oxide and nitrogen oxide in a homogeneous manner. ZS-1041 flue gas Anticorrosive coating All have good anti-corrosion effect. The calcium desulfurizer, whether in powder or slurry form, reacts with the reactants in a heterogeneous manner. The reaction only takes place on its surface. After the reaction product closes the surface, it is difficult to use the internal components of the particles. Even if the reaction time is prolonged, the benefits of particle breakage in disturbance can only be obtained. Under certain temperature conditions, sulfate radical compounds such as ammonium sulfate, ammonium bisulfate, ammonium sulfite, and ammonium bisulfate are generated and discharged from the kiln system with clinker, so as to remove sulfur dioxide from flue gas.
Effectively prevent the corrosion and scaling of the chimney caused by ammonia desulfurization and denitrification, and the strong anti-corrosion inside the chimney coating Application: ZS-1041 flue gas chimney anti-corrosion coating has high temperature resistance range, and the service life of chimney inner wall anti-corrosion in high-temperature ammonia spraying can be more than 5 years. ZS-1041 flue gas chimney anti-corrosion coating has excellent chemical corrosion resistance, especially condensation sulfuric acid corrosion. ZS-1041 flue gas chimney anti-corrosion coating has very high resistance to water vapor penetration. ZS-1041 Zhi flue gas chimney anti-corrosion coating has good performance of high temperature resistance and temperature change resistance, which can meet the long-term operating temperature fluctuation between 45 -- 600 ℃, short-term operating temperature 800 ℃, and protection action temperature 850 ℃. ZS-1041 anticorrosive coating for flue gas chimney also has high flexibility resistance and thermal expansion resistance, which can resist the inevitable vibration of steel chimney in operation despite reinforcement, effectively prevent the corrosion of flue gas by ammonia injection under high temperature, and avoid the corrosion and scaling of metal inner wall;
The desulfurization and denitrification of ammonia process, to a considerable extent, eliminates the harm of acid condensation, and greatly reduces the corrosion of flue gas on boiler at low temperature and coking and ash blocking. Cooperating with the corresponding design and operation, it can also improve the thermal efficiency of the boiler, save energy and reduce consumption. The main reason for the corrosion of the low-temperature heating surface of the coal boiler is that the flue gas containing sulfur dioxide, sulfur trioxide and nitrogen oxide dews to form acid solutions. The moisture condensation temperature (water dew point) in the flue gas itself is very low, generally about 30 ℃~60 ℃, but as long as there is 0.005% sulfur trioxide in the flue gas, the dew temperature (acid dew point) of the flue gas can reach more than 150 ℃. ZS-1041 flue gas anti-corrosion coating indicates that high-temperature condensation of flue gas containing sulfur oxide and nitrogen oxide will cause harm to equipment and operation from three aspects: (1) sulfuric acid and nitric acid solution directly corrode metal; (2) The acid liquor makes the ash deposit accumulate and harden, reducing the heat transfer efficiency, leading to ash blockage and increasing the ventilation resistance; (3) The equipment operation is forced to maintain a high exhaust gas temperature, which makes a large amount of heat loss from the chimney ineffectively.
