Method for sludge drying and incineration by swill-cooked dirty oil

Abstract

The invention relates to a method for sludge drying and incineration by swill-cooked dirty oil. The method comprises the following steps of 1, wet sludge drying: 1, heating swill-cooked dirty oil by a heat-conducting medium, keeping a temperature in a sludge drying tank in a range of 100-150 DEG C, adding wet sludge into the sludge drying tank, carrying out heat exchange and feeding the overflow of the swill-cooked dirty oil into a swill-cooked dirty oil heater, 2, oil-sludge separation and incineration: extracting oil-containing sludge, carrying out oil-sludge separation by an oil-sludge separation device, extracting the separated swill-cooked dirty oil, feeding it to the swill-cooked dirty oil heater, feeding sludge needing to be subjected to incineration into a sludge incineration furnace, carrying out incineration, feeding heat produced by incineration into a heat exchanger to heat the heat-conducting medium, treating tail gas by a tail gas treatment device until the tail gas satisfies standards, collecting fly ash and furnace slag produced by incineration, and carrying out concentrated treatment, and 3, steam cooling and separation: treating oil-water mixed steam by a condenser, feeding the condensation product into an oil-water separator, feeding the separated swill-cooked dirty oil into a swill-cooked dirty oil storage tank, recovering hot water as process water, and feeding noncondensable gas into the sludge incineration furnace. The method has a low processing cost and can realize sludge treatment reduction, harmlessness and recycling.

Description

technical field [0001] The invention relates to a sludge drying and incineration method using waste oil, belonging to the technical field of sludge water treatment Background technique [0002] Sludge treatment refers to the process of stabilization, reduction and harmless treatment of sludge, generally including concentration or conditioning, dehydration, anaerobic digestion, aerobic digestion, lime stabilization, composting, drying and incineration, etc. . Sludge disposal refers to the process of consuming sludge after treatment. my country's sludge treatment and disposal should comply with the principles of "safety and environmental protection, recycling, energy saving and consumption reduction, adapting measures to local conditions, and being safe and reliable". At present, the excess sludge produced by most sewage treatment plants first enters the sludge storage tank. After adding cationic polyacrylamide, it enters the belt dehydrator and centrifuge for mechanical dehy...

AI Technical Summary

Problems solved by technology

[0006] (1) Since the sludge with a water content of 80% is dehydrated and dried to a sludge with a water content of 20-30%, a dehydrator and a sludge dryer are required, and a sludge silo is required for feeding. Not only the process The process is relatively complicated, and the stability of the equipment is very high

[0007] (2) Since the calorific value of the feed sludge is not high, it cannot be self-sustained. Therefore, it is necessary to add auxiliary fuels to support the combustion during sludge incineration. These fuels include coal, diesel, natural gas, etc. The addition of auxiliary fuels will reduce the operating cost of sludge incineration. hard to control

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