Sludge recycling utilization process and system

Abstract

The invention discloses a sludge recycling utilization process and a system for realizing the process. The process comprises primary drying, secondary drying, carbonization, cooling and storage. According to the process, a biomass gasifier is utilized for heat supply, sludge treatment and biomass waste treatment are realized simultaneously, energy can be saved, environment can be protected, and according to the various discharge indexes, the dust emission concentration is less than 30 mg/m<3>, the SO2 discharge value is less than 20 mg/m<3>, the oxynitride discharge concentration is less than 250 mg/m<3>, and the Ringelmann black degree reaches level 1. According to the process and the system, biomass energy is taken as a main heat source for the system, and pyrolysis gas generated by a carbonizer in operation is taken as a supplementary heat source, so that heat is supplied to a primary dryer, a secondary dryer and the carbonizer; afterheat of tail gas of the carbonizer is recycled to the secondary dryer to be reused; tail gas of the primary dryer and the secondary dryer is subjected to dedusting through a cyclone dust collector and a water curtain spraying dust collector, and is subjected to desulfurization treatment to reach the standard to be discharged.

Description

Technical field [0001] The invention relates to the field of resource recovery treatment, and in particular to a process and system for resource utilization of sludge. Background technique [0002] Industrial wastewater, domestic sewage and even water plants will produce a large amount of sludge. By the end of 2015, China’s annual output of sludge reached 7.77 million tons, and these sludge needs to be treated. Sludge treatment is a process of reducing, stabilizing and harmless sludge such as thickening, conditioning, drying, stabilizing, drying or incineration. There are three traditional sludge treatment methods: incineration, landfill and resource utilization. The incineration process is often used abroad, but the investment is huge, which is easy to cause air pollution; domestic landfill is mostly used, but it requires a large amount of land and will cause secondary pollution to the environment; domestic Shanghai and other large and medium cities have very few land renewable...

AI Technical Summary

Problems solved by technology

However, the existing sludge carbonization technology is not mature enough, and there are many problems such as high cost, low treatment efficiency, low thermal efficiency, large energy consumption, large floor area, high equipment loss, and large odor release.

Moreover, the existing sludge carbonization process uses coal or natural gas for heating, and the use of coal causes serious environmental pollution, while the use of natural gas is more costly

Daily production and life will also produce a large amount of biomass waste, which is also in urgent need of treatment. Currently, sludge and biomass waste are treated separately, and other resources will be consumed during the treatment process

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