As more and more people attach importance to environmental protection, the gas cleaning in the power plant (desulphurization) becomes a key link in the eco-friendly project. The company has established technical cooperation with 8 environmental technology companies in Beijing, Wuhan, and Nanjing, etc. for 5 years. It mastered some patent technologies, and successfully used LW horizontal spiral decanter centrifuge, HY piston pushing centrifuge, and HR piston pushing centrifuge (The company obtained the centrifuge mechanical sealing device patent with application number: 200820211083.9) in the solid-liquid separation of desulphurization process to greatly improve production efficiency and product quality, achieve environmental requirement, and create economic profit for the power plant.