Sludge drying tail gas purification treatment system and method

Abstract

The invention discloses a sludge drying tail gas purification treatment system and method. The sludge drying tail gas purification treatment system comprises a thin-layer sludge drying device and a tail gas treatment device, and the tail gas treatment device comprises a control system, an ammonia gas recovery device and a mercaptan recovery device. On one hand, the structure of the thin-layer drying machine is improved, heat of waste steam is recycled, the waste steam is introduced into the preheating section of the drying machine and is used for preheating sludge together with a recycled heat source, the heat utilization rate of the waste steam is remarkably increased, and meanwhile cooling condensation of the waste steam is achieved by means of the low temperature of the sludge; and on the other hand, waste steam after cooling and condensation is purified, a tail gas purification device is improved, gas recovery and purification and liquid recovery and purification are carried out respectively according to composition characteristics of sludge drying tail gas, and efficient purification of the tail gas and recycling of recyclable substances in the tail gas can be achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to the sludge drying tail gas purification treatment technology. Background technique [0002] In the sludge thin-layer drying process, the wet sludge with high water content passes through the thin-layer dryer, and the moisture and organic matter in the wet sludge are heated under the heating of the heat source to produce volatile organic compounds, thermal decomposition gases and other products , called dry waste steam or dry tail gas, is discharged from the waste 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 process for dry t...

AI Technical Summary

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

Images