How to arrange desulfurization nozzles

Date:

2023-05-29 14:41

The arrangement of nozzles inside the tower is very important. Only through reasonable and optimized nozzle layout design can the system design requirements be met and the desulfurization system achieve high desulfurization rate. There are two methods for arranging nozzles inside the tower: one is concentric circle arrangement, and the other is matrix arrangement.
The following issues should be noted in the layout design of nozzles inside the tower:
(1) Choosing a reasonable nozzle coverage height is usually determined based on nozzle characteristics and the distance between two layers of spray.
(2) Choose a reasonable number of single-layer nozzles. Generally speaking, the number of nozzles is determined based on process calculations. Usually, a spray pipe network is arranged on each layer, and each layer should be equipped with enough nozzles to minimize the length of the pipeline connecting the nozzles. The number of nozzles shall be calculated according to the following formula:
N *= ψ× Do/d2
Among them ψ-- 200% or 220% (coverage; take an additional 220%)
Do - diameter of the spray area of the absorption tower (meters)
D2- Spray diameter of the nozzle at a distance of l meters (meters)
(3) When the nozzle coverage height is determined, the coverage area of a single nozzle can be calculated, where is the spray angle. A0 is the coverage area of a single nozzle, m2. Nozzle coverage height, m.
(4) When arranging nozzles in the desulfurization tower, choose the appropriate distance between the nozzles. Usually, the nozzle spacing is selected based on the number of nozzles and the diameter of the desulfurization tower, and it should be considered as a whole with the layout plan of the connecting nozzles.
(5) Choose a reasonable economic flow rate and determine the diameter of the limestone slurry main pipe and branch pipe based on the standards of the nozzle product.
(6) When checking the coverage rate of the spray layer in the desulfurization tower, not only should the impact of the collision between the nozzle liquid flow and the main pipe, branch pipe, and support on the coverage rate be considered, but also the uniformity of all nozzles in the desulfurization tower should be considered. The coverage rate of the spray layer in the desulfurization tower is as follows: а Is the coverage rate,%; N is the number of single-layer nozzles; A0 is the coverage area of a single nozzle, m2;
A is the cross-sectional area of the absorption tower, m2.
In engineering design, it is usually required that the coverage rate of spray inside the tower is between 200% and 300%, and the coverage is relatively uniform. When selecting the spacing between spray layers, it is also necessary to consider the impact of the collision between the nozzle liquid flow and the main pipe, branch pipe, and support on the coverage rate.