Biogas desulfurization and deodorization device and method

Abstract

The invention relates to a biogas desulfurization and deodorization device and method, and belongs to the technical field of chemical engineering. The biogas desulfurization and deodorization device comprises a fan, a rich liquid pipeline, a circulating pump, a fan, an absorption and regeneration tower, a back pressure valve, a filter and a pressure controller; the absorption and regeneration tower comprises an absorption chamber and a regeneration chamber, the absorption chamber and the regeneration chamber are separated by a partition plate, and an overflow hole is formed in the partition plate; the fan is communicated with an air inlet of the absorption chamber, a liquid outlet of the absorption chamber is communicated with a liquid inlet of the regeneration chamber through the rich liquid pipeline, and a circulating pump is arranged on the rich liquid pipeline; a back pressure valve is arranged at an exhaust port of the regeneration chamber, and the pressure controller is connected with the back pressure valve and the absorption chamber; a blocking partition plate is arranged between the air inlet of the regeneration chamber and the overflow hole, and the fan is communicated with the air inlet of the regeneration chamber; and at least one liquid extraction opening is formed in the side wall of the regeneration chamber. The device disclosed by the invention can be used for continuous desulfurization production.

Description

technical field [0001] The invention relates to a biogas desulfurization and deodorization device and method, belonging to the technical field of chemical industry. Background technique [0002] In landfills and livestock farms, a large amount of biogas is produced through biological fermentation processes. These biogases contain many toxic, harmful and malodorous components, such as hydrogen sulfide, ammonia, methylamine, etc. For safe use, desulfurization and deodorization of biogas are required. [0003] However, the current biogas desulfurization technology has the following disadvantages: [0004] (1) The energy consumption of the device is relatively high: the conventional process requires the use of lean liquid pumps and rich liquid pumps, and the power of each pump is usually more than tens of kilowatts. If a larger solution circulation volume is required, the energy consumption will be higher; [0005] (2) For the sake of process safety, it is usually necessary to...

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Problems solved by technology

In this way, the entire desulfurization process has more pipelines and occupies a larger area;

[0006] (3) The design and operation of the device are highly demanding, and a little carelessness may easily cause elemental sulfur to block the outlet pipeline of the regeneration tower due to sedimentation, resulting in shutdown of the device for maintenance

However, once the filtering equipment of this improvement measure breaks down, it is easy to cause the shutdown of the whole system. Common continuous filtering devices such as vacuum belt filters need to maintain a high concentration of sulfur slurry to operate stably, and the concentration of sulfur particles in the rich solution is usually Low, this kind of filtration cannot be achieved by using a vacuum belt filter; and for a filter element continuous filter device, once the filter element is blocked by sulfur, it must be stopped to replace the filter element, which is labor-intensive and low in process reliability.

Therefore, the reduction of sulfur clogging of subsequent equipment by filtering the sulfur particles in the rich liquid is currently at the stage of experimental verification, and there is still no satisfactory industrial application.

[0011] On the other hand, during the regeneration process of biogas desulfurization, since the air needs to be exhausted, although the tail gas discharge after regeneration meets the national standard, some foul odors are very strong even if the content is very low (1PPM), which is harmful to the health and safety of operators. A certain degree of damage to the surrounding environment

Few companies specifically propose solutions for the deodorization of renewable exhaust gas

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