Boiler desulfurization, denitrification, and dust collector

Boiler desulfurization, denitrification, and dust collector ammonia desulfurization is a technology for controlling sulfur dioxide emissions. Dust collectors can not only remove sulfur dioxide from flue gas, but also produce ammonium sulfate fertilizer products. The boiler desulfurization, denitrification, and dust collector uses ammonia water with a concentration (taking 28% as an example) as the desulfurizer to generate ammonium sulfate slurry, which is transported to the treatment system of the fertilizer plant. The required amount of ammonia water used in ammonia desulfurization is automatically adjusted by a preset pH control valve and measured by a flow meter. Ammonium sulfate crystals are crystallized from saturated ammonium sulfate slurry in the desulfurization and dust collector, generating suspended particles with a weight ratio of about 35%. These slurries are pumped to the processing plant by a sub pump, undergo primary and secondary dehydration, and then sent to the fertilizer plant for further dehydration, drying, condensation, and storage.

Dust removal principle of boiler desulfurization, denitrification and dust collector

Its main working principle is to make water droplets come into contact with dusty gas, and install baffles in the direction of airflow, using the collision between dust and water droplets to make the dust adsorbed by the water droplets. The baffle installed in the direction of airflow causes the airflow to move in a tortuous manner. On the one hand, it can prolong the residence time of the smoke, and on the other hand, it can change the flow direction of the smoke, increase the contact opportunity between dust and water droplets, and further enhance the ability to capture dust. Fine dust particles are adsorbed and captured by falling water droplets during the process of rising with the flue gas, thus achieving the purpose of dust removal. Clear water is evenly sprayed through the water spraying device, and after hitting the atomizing plate, it breaks into small water droplets and mist. This increases the contact area between the earth and the smoke, causing dust to be adsorbed by a large number of water droplets and the mass to increase. The flue gas undergoes a tortuous motion through the baffle, and fine dust particles are adsorbed and captured by the falling water droplets during the upward movement of the flue gas, thus achieving the purpose of dust removal. The dust on the baffle plate is washed into the sedimentation tank by water, filtered through two layers of coarse and fine filters, and becomes clean water. After being pressurized by the water pump, it enters the water spraying device for recycling. The sludge on the filter can be cleaned regularly. This device has low resistance, no water pollution issues, and the water can be recycled, making it very suitable for dust removal renovation of small hand fired boilers.

The boiler desulfurization, denitrification, and dust collector uses the flow velocity of flue gas to unintentionally sink over a large space and time, causing the smoke, dust, and particles mixed in the original active flue gas to dare to descend, resulting in a decrease in particulate matter and achieving a dust removal effect. It effectively captures and; The dust removal efficiency of particles with a thickness of 50um only reaches 50-60%. In the process of heavy pressure sinking dust removal, there are many beneficial aspects, such as changes in furnace temperature and wind speed, which can affect the particle reduction of smoke and dust, and cannot achieve the desired effect. On this basis, a sprinkler pipe is installed above the settling chamber to advance the dust removal effect, which is also the Zou type of wet dust removal.

The boiler desulfurization, denitrification, and dust collector is easy to maintain and operate. Different dust collectors are used in wet desulfurization and dust collectors to achieve dual effects of dust removal and desulfurization; The disadvantage is that the liquid discharged from the dust collector may undergo secondary treatment, otherwise it will cause environmental pollution and not be worth the loss. After the gas carrying these dust particles enters the Venturi throat, due to the constant cross-sectional area of the throat, the static pressure inside the pipe decreases to a relatively large value and remains unchanged. At this point, the airflow velocity reaches * value; The airflow enters the gradually expanding tube, and the flow velocity gradually decreases. Due to the interruption, the accumulation gradually expands, and the static inside the tube gradually recovers. At the end of the contraction tube or throat, dust removal liquid is introduced through a nozzle, and the airflow velocity at that location is very high. The nozzle sprays alkaline washing liquid to form water mist under the impact of high-speed airflow. Moreover, the relative velocities of gas, liquid, and solid phases are very high, which allows them to be fully mixed, thereby increasing the opportunity for sulfur dioxide to mix with alkaline droplets and allowing most of the sulfur dioxide and alkaline droplets to fully react, achieving the purpose of desulfurization. On the other hand, due to the sufficient atomization of alkaline detergent, the negative gas reaches saturation, thereby breaking the gas film on the surface of dust particles and increasing its own gravity. After the gas enters the expansion tube, the dust particles and droplets wetted by water, as well as the dust particles or droplets with different particle sizes, condense into larger sized dust droplets through collision and contact under the action of different inertial forces. These coarser dust containing droplets enter the main tower with the airflow and are separated from the airflow by gravity, inertia, and centrifugal force, thus achieving the purpose of purification.