| Customization: | Available |
|---|---|
| After-sales Service: | Yes |
| Warranty: | Yes |
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The process of dry desulfurization is loading certain height of desulfurizer into the desulfurization tower firstly,then biogas through the desulfurizer from bottom to top and H2S is removed. The desulfurizer is commonly used as iron oxide, which is cylindrical in shape. The principle of iron oxide desulfurization is as follows:
Fe2O3·H2O+3H2S=Fe2S3·H2O+3H2O
Fe2O3 absorbs H2S and becomes Fe2S3. With the continuous production of biogas, iron oxide absorbs H2S. When the certain amount of H2S is absorbed, the removal rate of H2S will greatly decrease until zero.Fe2S3 can be reduced and regenerated, and can be reduced to Fe2O3 through chemical reactions with O2 and H2O. The principle is as follows:
2Fe2S3·H2O+3O2=2Fe2O3·H2O+6S
Based on the above two reaction equations, Fe2O3 absorbs H2S and then turns into Fe2S3. To reduce Fe2S3 to Fe2O3, O2 and H2O are required. This can be achieved by adding air to the tower or air drying for desulfurization.
Biogas desulfurizing system is for the pre-treatment of raw biogas from anaerobic reactor, suitable for biogas flow 20 ~ 500 Nm³/hr. The raw biogas from digester always contains saturated water vapor, physical impurities and hydrogen sulfide. These substances should be removed before the utilization of biogas, to avoid damage to generator.
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