Sludge grading, drying and carbonizing system

Abstract

The invention discloses a sludge classification drying and carbonization system, which relates to the technical field of sludge drying, carbonization, energy conservation and environmental protection, and comprises a sludge indirect drying device, a low-temperature drying device, a carbonization device, a hot blast stove and a heat exchanger. The method comprises the following steps: indirectly drying sludge by utilizing waste heat of a carbonization jacket and preheated air I, and then introducing the sludge into low-temperature drying equipment to carry out secondary low-temperature drying on the sludge by utilizing indirect drying waste heat and preheated air II. The dried sludge is introduced into carbonization equipment for carbonization, a carbonization system is indirectly supplied with heat by introducing high-temperature hot flue gas generated by combustion of natural gas in a hot blast stove I into a carbonization equipment jacket, pyrolysis gas generated by carbonization is combusted by a hot blast stove II to generate hot flue gas, and the hot flue gas is used as a sludge drying heat source after heat exchange. According to the invention, heat is graded and utilized according to the characteristics of sludge pollutants, so that the treatment capacity of the sludge carbonization system is improved, the output of pollutants in waste gas is reduced on the premise of saving energy consumption, and the purposes of energy conservation and emission reduction are achieved.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and disposal, in particular to a sludge classification drying and carbonization system. Background technique [0002] With the upgrading of sludge disposal standards in my country and the advancement of sludge treatment technology, sludge carbonization technology can convert sludge with a moisture content of 40% to 99% into a black granular sludge-based biochar with a moisture content of less than 5%. , to achieve the goal of "four modernizations" of sludge disposal. The conventional technology is to reduce the moisture content of sludge with a moisture content of 99% to 60% to 80% through chemical conditioning and mechanical dehydration, and then use the hot flue gas generated by fuel combustion to directly dry the sludge, and at the same time, the sludge is carbonized. The generated pyrolysis gas and fuel are mixed and burned as a supplementary heat source for the system; due to the hig...

AI Technical Summary

Problems solved by technology

The conventional technology is to reduce the moisture content of sludge with a moisture content of 99% to 60% to 80% through chemical conditioning and mechanical dehydration, and then use the hot flue gas generated by fuel combustion to directly dry the sludge, and at the same time, the sludge carbonization process The generated pyrolysis gas and fuel are mixed and burned as a supplementary heat source for the system; due to the high temperature of the hot flue gas, direct drying with the hot flue gas will cause some volatile pollutants in the sludge to overflow, and the hot flue gas is mixed with sludge Carbonization of pollutants in pyrolysis gas leads to complex components and high concentrations of pollutants in dry waste gas, which greatly increases the difficulty of waste gas treatment technology and investment and operation costs, which is not conducive to the promotion and application of carbonization technology

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