System used for processing sludge

Abstract

The invention discloses a system used for processing sludge. The system comprises a municipal combustion gas conveying pipeline, a combustor, a destructive distillation machine, a purifying device, apyrolysis gas conveying pipeline, and a control device; the municipal combustion gas conveying pipeline is provided with a municipal combustion gas regulating valve, and a rapid switching valve; the combustor is provided with a secondary wind inlet, an oxidant gas inlet, and a combustion flue gas outlet, the secondary wind inlet is provided with a secondary wind regulating valve, the oxidant gas inlet is provided with an oxidant gas regulating valve, and the combustion flue gas outlet is provided with a flue gas temperature sensor; the destructive distillation machine is provided with a sludgeinlet, a combustion flue gas inlet, a pyrolytic carbon outlet, and a pyrolytic gas outlet; the purifying device is provided with a pyrolytic gas inlet and a purified gas outlet; the pyrolysis gas conveying pipeline comprises a first branch pipeline and a second branch pipeline, the first branch pipeline is provided with a blowoff valve, the second branch pipeline is provided with a pyrolysis gastemperature sensor, a pyrolysis gas pressure sensor, a pyrolysis gas flow amount sensor, a pyrolysis gas analyzer, and a pyrolysis gas regulating valve; the control device is connected with the municipal combustion gas regulating valve, the rapid switching valve, the secondary wind regulating valve, the oxidant gas regulating valve, the flue gas temperature sensor, the blowoff valve, the pyrolysisgas temperature sensor, the pyrolysis gas pressure sensor, the pyrolysis gas flow amount sensor, the pyrolysis gas analyzer, and the pyrolysis gas regulating valve.

Description

technical field [0001] The invention belongs to sludge resource utilization technology, in particular to a system for treating sludge. Background technique [0002] The sludge drying pyrolysis carbonization treatment process is a relatively advanced sludge treatment technology, which can eliminate the dioxin pollution produced by sludge incineration, and at the same time meet the needs of the country's greenhouse gas emission reduction. The biochar produced is mainly used for building materials and gardens Soil improvement, etc., the specific process is: the sludge (moisture content 80-90%) produced by sewage treatment is treated by a dryer three times to reduce the moisture content of the sludge to below 20%, and the moisture content of the sludge is reduced to 20% by a screw conveyor. % of the sludge is transported to the inside of the retort, and by heating the outside of the retort, the sludge in the retort is heated to 660-780°C by heat conduction, so that the component...

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Problems solved by technology

[0003] Before the pyrolysis gas is produced, the fuel of the burner is municipal natural gas. At this time, the gas supply pressure of the municipal gas is basically unchanged, and the calorific value is stable, which is basically stable for the combustion of the burner; with the sludge carbonization and pyrolysis The pyrolysis gas is gradually produced, and the pyrolysis gas will enter the burner of the carbonization machine to participate in the combustion. The composition and rate of the generated pyrolysis gas are not fixed, which has a great impact on the combustion of the burner: 1. When the heat When the output of pyrolysis gas is low, it is easy to cause the burner to extinguish the fire; 2. When the output of pyrolysis gas is high, it will lead to insufficient combustion of combustible gas in the burner, producing a large amount of nitrogen oxides to pollute the environment, and at the same time, carbon oxides are produced, resulting in explosions

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