Sludge drying and incineration coupled treatment system

Abstract

The invention provides a sludge drying and incineration coupling treatment system, which includes at least one high-temperature sludge oven and one low-temperature sludge oven. The top of the high-temperature sludge oven is connected with a first steam pipe, which is branched into a first steam branch pipe and a The second steam branch pipe, the first steam branch pipe passes through a heat exchanger and communicates with the fluidized bed incinerator, the second steam branch pipe passes through a reheater and is re-introduced and connected to the high-temperature sludge oven, and the top of the low-temperature sludge oven A first air pipe is arranged in communication, and after passing through a water cooler and a heat exchanger in sequence, it is re-introduced and communicated with the bottom end of the low-temperature sludge oven. The flue gas pipe of the fluidized bed incinerator and the second steam branch pipe exchange heat. The invention adopts the treatment method of two-stage drying and incineration of sludge, which effectively improves the utilization rate of thermal energy while realizing the final disposal of sludge, and can fully meet the needs of municipal sludge treatment with generally low calorific value. .

Description

technical field [0001] The invention relates to the technical field of sludge reduction in sludge industry, in particular to a sludge drying and incineration coupling treatment system Background technique [0002] With the continuous development of domestic economy and urbanization, the continuous improvement of sewage treatment capacity, the amount of sludge, the final product of sewage treatment, is also increasing. ~90 million tons. Sludge is an extremely complex heterogeneous body composed of organic debris, inorganic particles, bacterial cells, colloids, etc. In order to avoid secondary pollution, the sludge must be deeply dewatered and stabilized. Due to the high population density in China and the shortage of land resources, the traditional extensive treatment methods such as landfill are unsustainable. It can be seen that the harmless treatment and disposal of sludge will be a key and difficult problem in the field of environmental protection. Sludge incineration t...

AI Technical Summary

Problems solved by technology

Due to the problems of domestic people's living standards, sewage collection methods, and sediment mixing in pipe networks, the calorific value of domestic municipal sludge is generally low (the absolute dry calorific value of sludge is about 2000kcal / kg), and auxiliary fuel needs to be heated for direct incineration, increasing The operating cost of sludge incineration has greatly hindered the popularization and application of incineration technology. There is an urgent need for a dry incineration technology suitable for low calorific value sludge to achieve sludge reduction, stabilization, harmlessness, and resource utilization. Disposal of processing

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