Main principle of the composite water film desulfurization dust collector

The overflow composite granite water film dust collector is mainly composed of a venturi, a main cylinder, an upper water injection tank, lower overflow holes, cleaning holes, etc. I. Working principle: The dust-containing gas flow enters the Venturi through the inlet flue, where water is evenly sprayed at the inlet of the throat. Due to the high velocity of the flue gas, the sprayed water is dissolved into fine mist, thereby moistening the ash particles in the flue gas. During this process, the ash in the flue gas is wetted, increasing its weight and thus facilitating centrifugal separation. In the high-speed flocculent flow state, due to the significant difference between water droplets and dust particles, their velocity differences are also large. In this way, the ash particles collide with and coalesce with the water droplets; in particular, the fine dust particles can be dissolved by the water mist. All of this prepares the ash material well for separation, after which it enters the cylinder. The cylinder is circular in shape; water enters the cylinder from the water supply tank at the top of the dust collector, forming a water film on the inner wall of the entire cylinder that flows from top to bottom. The flue gas enters tangentially at the bottom of the cylinder and rises while rotating inside it. Under the effect of centrifugal force, the dust-containing gas continuously comes into contact with the water film on the inner wall of the cylinder, thereby being moistened by the water film. The dust particles then flow downward along with the water to the bottom of the dust collector, where they are discharged through the overflow holes. A bottom seal is installed at the bottom of the cylinder, along with a water seal groove to prevent flue gas from leaking out from that area. Cleaning holes are provided to facilitate cleaning the bottom of the cylinder. After dust removal, the wastewater is discharged through the bottom overflow holes into a sedimentation tank, where it settles and is then reused. The purified gas is discharged through the conical portion at the upper part of the cylinder, thereby achieving dust removal. Adding alkaline water to the circulation pool can achieve desulfurization. II. Features: The composite granite water film dust collector is characterized by its low cost, easy installation, and light weight, which reduces the price of the dust collector; it is an ideal product for use with boilers. 　　1. Natural granite is used and mechanically processed into circular curved plates, resulting in a smooth and even overall structure. It has properties of corrosion resistance, wear resistance, and high-temperature resistance. 　　2. The exterior is cast using high-strength materials resistant to high temperatures and acids and alkalis. The rebar mesh is cast using steel molds. 　　3. The upper water tank is made of ceramic, which ensures no leakage during use; this solves the problem of water seepage from the water tanks in traditional granite dust collectors and improves the performance of these dust collectors. 　　4. The interior is smooth and flat, reducing water consumption to 2/3 of the original level and thus lowering operating costs. 　　5. It is easy to install; each section is typically 1 meter long, and it can be lifted in place, which reduces the construction time. 　　6. Since each section of the body is 1 meter long and there are no seams inside, there are male and female joints at the ends of each section; during installation, acid-resistant adhesive is applied to these joints to ensure that no water leaks at the connection points. 　　7. Due to its light weight, the composite granite water film dust collector reduces the costs associated with foundations and transportation. 　　8. Flanges are provided for both import and export, along with their corresponding dimensions; during installation, the joints between the flanges should be sealed with asbestos rope to prevent air leakage, which could affect the dust removal efficiency. III. Main technical specifications and parameters:
Dust removal efficiency: >98%
Sulfur removal efficiency: >80%
Inlet flue gas velocity: 17.5–23.5 m/s
Outlet flue gas velocity: 8–14 m/s
Flue gas velocity inside the droplet catcher cylinder: 3.5–5.5 m/s
Static pressure in the overflow tank: 2–5 mmH2O
Cylinder resistance: 70–120 mmH2O
Water vapor ratio (a): 0.12 kg/m3
Water consumption (G_water, kg/h): G_water = a × Q; where a is the water vapor ratio and Q is the volume of flue gas processed per hour in m3/h.
Temperature of flue gas after dust removal: 50–80°C
Last edited by johncom on 2009-4-17 at 13:21]

“The overflow composite granite water film dust collector is mainly composed of a venturi, a main cylinder, an upper water injection tank, lower overflow holes, cleaning holes, etc. ”Learned*