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Desulfurization nozzles are usually arranged in the desulfurization tower to remove sulfur dioxide and some polluting gases in the flue gas. At the same time, the desulfurization nozzle can also realize the function of dust removal. The basic principle of dust removal for desulfurization nozzles is to wet the dust particles with water mist, increase their particle size and specific gravity, and then separate them from the atmosphere or flue gas. In order to make the desulfurization effect reach the standard, we must reasonably arrange the desulfurization nozzles in the tower, and pay attention to six points in the design. First of all, let’s first understand the application of desulfurization nozzles in the desulfurization and dust removal industry.

The application of desulfurization nozzles in the desulfurization and dust removal industry is mainly to wet the dust particles with water mist, increase the particle size and specific gravity, and then separate the dust particles from the atmosphere or flue gas. Different desulfurization processes use different nozzle forms. The material conveyed in the dry desulfurization process is desulfurizer powder, usually using airflow nozzles. In the semi-dry desulfurization process, limestone slurry is conveyed with high concentration and high viscosity, and air flow nozzles are usually used. Studies have shown that gas-liquid mass ratio and concentration are the main parameters affecting the average droplet size. An increase in the gas-liquid mass ratio resulted in a decrease in the average size of the droplets; as the concentration increased, the average size increased. In the wet desulfurization process, the nozzle is usually used to clean the flue gas of the desulfurization scrubber, clean the blades of the demister, etc. The spray droplets required for this process are typically 1300-3000 microns in diameter. Considering factors such as energy consumption and nozzle friction, pressure nozzles are usually used.

For the pressure nozzle used in the wet flue gas desulfurization process, it is required that the components that allow the liquid to obtain rotational motion are as simple as possible. Due to the large size of the required atomized particles, a rotary pressure nozzle is usually used. From the perspective of comprehensive economy and characteristics, the commonly used pressure nozzles in the desulfurization process mainly include solid conical vortex nozzles, hollow conical vortex nozzles, air conical spiral nozzles and solid conical spiral nozzles. Among them, the application of the hollow conical vortex nozzle is the most common.

Because the position of the nozzle in the wet desulfurization process determines the importance of the research on the desulfurization nozzle, with the progress of the process research, the research on the nozzle is gradually in-depth. At present, there are still few researches on the application of pressure nozzles with limestone slurry as the medium, and the research is usually carried out with water as the medium. There are few studies on the structure of the flow field inside and outside the nozzle and the arrangement of the nozzle in the spray tower.

In short, as far as the pressure nozzle is concerned, its research has been carried out for more than 100 years, and a relatively complete theoretical system has been formed. However, there are relatively few studies on nozzles combined with desulfurization processes.

The six key points of desulfurization nozzle tower layout design are: (1) Choose a reasonable nozzle coverage height, which is usually determined according to the characteristics of the nozzle and the distance between the two layers of spray.
(2) Choose a reasonable number of single-layer nozzles. Generally speaking, the number of nozzles is determined according to process calculations.
(3) After the nozzle coverage height is determined, the coverage area of a single nozzle can be calculated, the formula is A0=πH2tg2{ɡ/2} (ɡ is the injection angle).
(4) When arranging the nozzles in the desulfurization tower, choose the appropriate distance between the nozzles. Usually, the choice of nozzle spacing is determined according to the number of nozzles and the diameter of the desulfurization tower, and should be connected with the nozzle

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