The advantage of wet dedusting is easy maintenance. By preparing different dedusting agents, the effects of dedusting and desulfurization (denitration) can be achieved at the same time. The disadvantage is that the dedusting liquid needs to be treated, which may lead to secondary pollution. When designing or selecting the bag filter according to the air volume, it is generally not allowed to operate when the air volume exceeds the specified air volume, otherwise it is easy to block the filter bag, shorten the service life, greatly increase the pressure loss and reduce the dust removal efficiency. However, the air volume should not be too large, otherwise the equipment investment and floor area will be increased.
There are many PPS filter materials used at present. The temperature is 170 ℃. For bag filter, the relationship between service temperature and dust removal efficiency is not obvious, which is different from electrostatic precipitator. For electrostatic precipitator, the change of temperature will affect the specific resistance of dust and dust removal efficiency. FRP has poor long-term temperature resistance. FRP generally cannot be used at high temperature for a long time. Generally, the strength of polyester FRP will decrease significantly above 50 ℃, and it can only be used below 100 ℃. When the temperature exceeds 60 ℃, the strength of general epoxy FRP decreases obviously.
However, high temperature resistant resin can be selected to maintain the long-term working temperature at 200 ~ 300 ℃. The interlaminar shear strength of glass fiber reinforced plastics (FRP) is borne by resin, so it is relatively low. The cleaning holes of membrane desulfurization dust remover shall be located at the side or upper part of the pipeline, and all cleaning holes must be tight and airtight. If there is air leakage, the flow rate in the pipeline upstream of the cleaning hole will be reduced, and the dust accumulation will be more serious, resulting in the reduction of the exhaust volume of the dust suction hole. Therefore, attention must be paid to details in the daily maintenance of FRP desulfurization and dust collector.
In the actual operation, due to the intermittent operation of the production equipment of the biogas desulfurization unit and some factors not considered, the dust will also be deposited in the pipeline, the more accumulated and thicker, which is difficult to remove at the moment.
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