A kind of sludge drying tail gas purification treatment system and method

Abstract

The application discloses a sludge drying tail gas purification treatment system and method. The sludge drying tail gas purification treatment system includes a thin-layer sludge drying device and a tail gas treatment device, and the tail gas treatment device includes a control system, an ammonia gas recovery device and a Mercaptan recovery unit. On the one hand, the present invention carries out structural transformation of the thin-layer dryer, recovers and utilizes the heat of the waste steam, introduces the waste steam into the preheating section of the dryer, and uses the waste heat to preheat the sludge together with the recovered heat source, thereby significantly improving the waste steam. At the same time, the cooling and condensation of waste steam is realized by the low temperature of sludge; on the other hand, the waste steam after cooling and condensation is purified and treated, and the tail gas purification device is improved. According to the composition characteristics of sludge drying tail gas, Gas recovery and purification and liquid recovery and purification are carried out respectively, which can realize efficient purification of tail gas and recycling of recyclable substances in tail gas.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to the purification and treatment technology of sludge drying tail gas. Background technique [0002] In the thin-layer sludge drying process, the wet sludge with high water content passes through the thin-layer dryer, and heats the moisture and organic matter in the wet sludge under the heating of the heat source to produce volatile organic compounds, thermal decomposition gases and other products. , called drying waste steam or drying tail gas, is discharged from the exhaust gas outlet of the dryer, and the dry sludge is discharged from the sludge outlet to realize the drying of the sludge. In the sludge thin-layer drying process, the drying tail gas includes dust, volatile organic compounds, ammonia, hydrogen sulfide and other gases, and usually requires further treatment of the drying tail gas to meet the emission standards. In the prior art, the treatment proces...

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Problems solved by technology

In the prior art, the treatment process for dry tail gas mainly includes absorption method, biological method, adsorption method, low-temperature plasma oxidation method, and photocatalytic method, but the effect of a single treatment method is not good, for example, the absorption method does not include the treatment of pollutants The explanation is that the adsorption method is inconvenient to replace the adsorbent, the desorption of the adsorbent is difficult, the reaction conditions of the biological method are not easy to control, the biological adaptability is poor, the plasma oxidation equipment is expensive, and the photocatalytic method usually needs to be combined with sludge pretreatment steps to facilitate the product. break down

[0003] Therefore, the prior art is still unsatisfactory for the purification treatment effect of the dried tail gas, and lacks the effective utilization of the recyclable substances in the tail gas

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