Sludge drying flue gas treatment system and treatment process for municipal sewage treatment plant

Abstract

The invention belongs to the field of flue gas purification treatment, and particularly relates to a sludge drying flue gas treatment system for a municipal sewage treatment plant. The flue gas treatment system comprises an induced draft fan, a flue gas cooling and backwashing system, a biological washing and biological filtering pond system, an exhaust deep treatment system, a backwashing system and an acid or alkaline solution adding system. The invention further discloses a process for treating flue gas by adopting the flue gas treatment system. The sludge drying flue gas treatment system provided by the invention has a very strong effect on removing the components of VOCs, hydrogen sulfide and ammonia gas. The system provided by the invention is in accordance with the idea of clean production, and has the characteristics of energy conservation, high efficiency, simple device, low operating and maintaining cost, no secondary pollution and environment friendliness.

Description

technical field [0001] The invention belongs to the field of flue gas purification and treatment, and in particular relates to a flue gas treatment system and a treatment process for sludge drying in municipal sewage plants. Background technique [0002] With the acceleration of urbanization in our country, the arbitrary stacking and discarding of a large amount of sludge produced by sewage treatment has caused new pollution to the environment. The thermal drying treatment of sludge effectively disinfects and sterilizes sludge through high temperature. Regardless of whether indirect or direct treatment is used, the mixed gas contains flue gas from the heat source, water vapor from sludge evaporation, and sludge. Various gases released. [0003] Sludge drying tail gas mainly has the following characteristics: On the one hand, the temperature is high: the suitable drying temperature range for sludge drying is 150-250 °C, and the tail gas treatment process needs to first cool ...

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Problems solved by technology

However, the synergistic incinerator temperature of this incineration system is 900-1000°C, and the outlet flue gas temperature is 850-1000°C. The process equipment for subsequent waste heat utilization is complicated, and the waste heat is used to generate power. However, this process can only be used in large-scale sewage treatment facilities. , not suitable for sludge drying flue gas of general sewage plants

[0008] The document with the application number 201120383959.X discloses a dry-type flue gas treatment system for sludge incineration. The flue gas generated after incineration at about 220°C is subjected to cyclone dust removal, gas cooling, desulfurization agent is added and bag dust removal is used for treatment. The removal rate of smoke and dust is above 99.9%, but this process can only have a high removal effect on smoke and dust, and does not substantially remove odor VOCs, and the odor concentration index still cannot meet the standard

[0009] The above-mentioned invention does not substantially reduce the thermal pollution of flue gas or requires a huge cost to achieve the treatment effect. Regarding the treatment of sludge drying tail gas, the current domestic technology is not very mature, and it is only the sludge of large-scale sewage treatment facilities. Dry tail gas is effectively treated

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