Demister pads are commonly used in various industrial processes, including sulphuric acid plants, to separate liquid droplets from gas or vapor streams. In the context of a sulphuric acid plant, demister pads play a crucial role in several areas where mist elimination is required. Here’s how demister pads are used in a sulphuric acid plant:
Absorption Towers: In the absorption towers of a sulphuric acid plant, demister pads are installed at the top of the tower to remove entrained sulfuric acid mist from the exhaust gas stream. These demister pads help prevent acid mist from escaping into the environment and help protect downstream equipment, such as fans and scrubbers, from corrosion caused by acid droplets.
Drying Towers: In the drying towers, which are part of the sulfuric acid production process, demister pads are used to remove moisture and sulfuric acid mist from the hot gases leaving the tower. The demister pads in this application help maintain the desired product quality by preventing acid mist from contaminating the final sulfuric acid product.
In all these applications, the demister pads function by impinging and capturing the liquid droplets or mist in the gas or vapor stream. The entrained droplets collide with the surfaces of the demister pads, coalesce, and eventually drain down the pad, while the cleaned gas or vapor passes through the demister and continues downstream.
Demister pads used in sulphuric acid plants are typically made of materials resistant to corrosion by sulfuric acid, such as acid-resistant alloys or special plastic materials. These materials ensure the demister pads can withstand the corrosive environment and maintain their effectiveness over time.
By utilizing demister pads in sulphuric acid plants, the plants can minimize acid mist emissions, protect equipment from corrosion, improve product quality, and comply with environmental regulations regarding air pollution control.
