Currently, there are dozens of flue gas desulfurization technologies. According to whether water is added during the desulfurization process and the dry or wet form of desulfurization products, flue gas desulfurization is mainly divided into three major categories: wet method, semi-dry method, and dry method. Among them, the wet desulfurization technology has a high degree of maturity, outstanding efficiency, and is easy to operate.
The wet flue gas desulfurization processes around the world are similar in process, form, and mechanism. Usually, slurries such as limestone (CaCO₃), lime (CaO), or sodium carbonate (Na₂CO₃) are used as detergents to wash the flue gas in the reaction tower, thereby removing SO₂ in the flue gas. This technology is a gas-liquid reaction with a fast reaction speed. The desulfurization efficiency generally exceeds 90%, and it has a wide range of applications. It occupies a dominant position among many desulfurization technologies, accounting for more than 80% of the total installed desulfurization capacity, and the production operation is safe and reliable.
Our company's GRAT hard-sealed electric control butterfly valve has shown excellent performance in the desulfurization industry. Taking the coking tail gas treatment as an example:
- Purpose: Precisely adjust the concentration of coking tail gas.
- Medium: Process gas containing SO₂, SO₃, O₂, N₂, CO₂, and H₂O.
- Nominal Pressure: PN16.
- Calibers: Covering DN350, DN450, DN500, and DN800.
- Materials: The valve seat and valve core are made of SUS304 stainless steel, and the valve body is made of WCB cast steel.
- Connection Method: Wafer type, which is simple for installation and maintenance.
- Action Method: Proportional control is achieved through a 4 - 20mA signal. The electric actuator is intelligent and integrated, with local/remote switching functions and a liquid crystal display for convenient monitoring.
- Working Power Supply: AC380V.
- Design Life: 5 years, capable of operating efficiently under harsh working conditions.
Operation Date: Put into use in Jinan Laigang Group in October 2020.
Product Advantages
- High Sealing Performance: Adopting a hard-sealed design, it can effectively cope with high-pressure, high-temperature, and corrosive media to prevent leakage.
- Strong Corrosion Resistance: The valve seat and valve core made of SUS304 stainless steel can resist the erosion of sulfur-containing gases and other corrosive media for a long time.
- Precise Adjustment: With the help of a 4 - 20mA signal, the flue gas flow and concentration can be accurately regulated.
- Intelligent and Convenient: The electric actuator supports local and remote operations, and the liquid crystal display is conducive to real-time monitoring.
- High Reliability: The WCB cast steel valve body has high mechanical strength and pressure resistance, and operates stably.
- Simple Installation and Maintenance: The wafer connection method greatly reduces the installation and maintenance workload.
The GRAT hard-sealed electric control butterfly valve, with its excellent sealing, corrosion resistance, adjustment ability, and intelligent features, is highly competitive in the desulfurization industry. Applied to wet desulfurization, it can not only improve the desulfurization efficiency but also reduce the operating cost, providing a reliable solution for industrial flue gas treatment.