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In the process of biogas desulfurization, a biogas desulfurization tower is a commonly used desulfurization device. The following provides a detailed explanation of the principle, structure, and operation mode of such towers. 1. Principle of biogas desulfurization tower: The biogas desulfurization tower utilizes the principle of chemical absorption to remove sulfur compounds. During the desulfurization process, biogas containing hydrogen sulfide is brought into contact with an absorbent solution; through mass transfer and chemical reactions, hydrogen sulfide is absorbed into the solution, thereby achieving desulfurization. 2. Structure of the biogas desulfurization tower: A biogas desulfurization tower generally consists of the following components: 1) Tower body: The tower body is the main part of the entire desulfurization system, and it usually adopts a cylindrical or square prism shape. The tower is usually made of acid-resistant materials to withstand the corrosion of the absorbing liquid. Fillers or ribbed partitions are installed inside the tower to increase the contact area and facilitate contact between the absorbent solution and biogas. 2) Absorption circulation system: The absorption circulation system is a key component of the biogas desulfurization tower; it consists of pumps, pipes, and circulation tanks. The pump is used to draw the absorption liquid out of the circulation tank; after coming into contact with biogas in the tower, it flows back to the circulation tank. Through the circulation system, the concentration and pH value of the absorption solution can be maintained to improve the desulfurization efficiency. 3) Outlet pipeline: The outlet pipeline is the channel through which the desulfurized biogas is discharged, and it is usually connected to biogas generators or other utilization devices. In the outlet pipeline, exhaust valves and monitoring instruments are generally also installed to measure the hydrogen sulfide content and flow rate of biogas. 3. Operation modes of biogas desulfurization tower: There are various operation modes for biogas desulfurization towers, with steady-state operation and intermittent operation being the most common ones. 1) Steady-state operation: During steady-state operation, the absorption liquid is continuously circulated and supplied to the desulfurization tower, while the desulfurized biogas is continuously discharged from the top of the tower. A stable desulfurization effect can be achieved by controlling the flow rate and concentration of the absorbent solution. Steady-state operation is suitable for situations where the levels of biogas and hydrogen sulfide remain relatively stable. 2) Intermittent operation: During intermittent operation, the desulfurization tower is turned on and off as needed. When the biogas production and hydrogen sulfide content increase, the desulfurization tower can be activated; when these values decrease, the tower can be shut down in order to save energy and extend the lifespan of the absorption solution. Intermittent operation is suitable for situations where biogas production and hydrogen sulfide levels fluctuate significantly. A biogas desulfurization tower is a crucial piece of equipment in the utilization of biogas, and it is widely used. Without an efficient and reliable desulfurization tower, large-scale, high-value, and safe utilization of biogas becomes impossible. It acts as the “safety guardian” in the entire biogas energy utilization chain.