In the fixed-bed dry desulfurization technology, we use an oxidation catalyst to first oxidize the sulfur dioxide in the flue gas to sulfur trioxide, and then react with calcium hydroxide to produce calcium sulfate. The engineering realization of this technology adopts a fixed-bed technology, i.e., an intermittent moving bed. In the desulphurization plant, we load the formed particles of the dry sulfur dioxide adsorbent to form a fixed bed. As the flue gas flows through this fixed bed, the sulphur dioxide is oxidized to sulphur trioxide and reacts with calcium hydroxide to form a calcium sulphate solid.
No water is used in the whole process, and no wastewater is generated. In addition, since the molded particles of the SO2 dry adsorbent have high reactivity, there is no need for whitening treatment. The operation control process is very simple, and the desulfurization effect can be adjusted by simply controlling the contact time. This technology is not sensitive to some fluctuations in flue gas conditions for a short time, and the flue gas temperature does not affect its desulfurization efficiency. Suitable for almost all flue gas conditions, the desulfurization effect can achieve 100 % removal.
Whether it is in the flue gas desulfurization of power plants or the desulfurization of coking oven industrial civil boilers, this method can effectively achieve the purpose. The process is simple, the results are remarkable, and the investment and operating costs are low. In a dry desulfurization fixed bed, flue gas enters from below and flows upwards;The sulfur dioxide dry adsorbent flows from the top to the bottom under the action of gravity, and is in retrograde contact with the flue gas. This design makes the desulfurization reaction not obviously affected by the flue gas temperature, and has a good desulfurization efficiency in the range of room temperature to 300 °C.
In addition, the flue gas homogenization device also cleverly uses the saturated desulfurizer to effectively intercept the dust in the flue gas, and realizes the effect of deep dust removal. The height of the SO2 dry adsorbent layer can be flexibly adjusted as needed to calmly cope with changes in SO2 concentration and dust in the flue gas. The dry desulfurization fixed bed adopts a modular design in structure, which adapts to the change of boiler load through flexible unit opening and closing, and the system layout is also very flexible, which can operate under positive and negative pressure.
In short, fixed-bed dry desulfurization technology is a simple, efficient and environmentally friendly flue gas treatment technology. It is designed to meet the needs of applications of all sizes, from large power plants to small industrial boilers. With this technology, we can effectively remove pollutants such as sulfur dioxide from flue gases and make a positive contribution to environmental protection.